code: def sylvester(input_dim, count_transforms=None):
      """
      A helper function to create a :class:`~pyro.distributions.transforms.Sylvester`
      object for consistency with other helpers.
  
      :param input_dim: Dimension of input variable
      :type input_dim: int
      :param count_transforms: Number of Sylvester operations to apply. Defaults to
          input_dim // 2 + 1. :type count_transforms: int
  
      """
  
      if count_transforms is None:
          count_transforms = input_dim // 2 + 1
      return Sylvester(input_dim, count_transforms=count_transforms)
  
file_path: pyro/pyro/distributions/transforms/sylvester.py
imports: import torch
  import torch.nn
  from ..None import constraints
  from ..torch_transform import TransformModule
  from ..util import copy_docs_from
  from .householder import Householder
label_desc: Use image node_id 1 for calling a global function with example usage: sylvester(input_dim, count_transforms) and returns: Sylvester